Explanation of Figures. 
The references to authors refer to the following works, otherwise the 
figures may be located by means of the appended references. 
De Kay, N. Y. Fauna, Fishes. 
_ Storer, Hist. Fish. Mass. 
Miiller and Henle, Syst. Besch. Plagiost. 
Bean, Bull. U. S. F. Com., VII, 1887. 
Goode, Nat. Hist. Aquat. Animals. 
Jordan and Evermann, Fishes of N. and Mid. Am. in Bull. U. S. Nat. 
Mus. No. 47. 
Holbrook, N. Am. Herpetology, second edition. 
Cope, Batrachia of N. Am. in Bull. U. S. Nat. Mus. No. 34. 
Cope, Croc. Liz. Snakes N. Am. in Rep. U. S. Nat. Mus. 1808. 
Agassiz, Contrib. Nat. Hist. U. S., II. 
Petromyzon marinus. 
Fig. in Rep. 1905, p. 49, from Goode (Pl. 251). 
Carcharias littoralis. 
Pl. 70 in Rep. 1906, from Storer (Pl. 36, fig. 1). 
Alopias vuipes. 
Fig. in Rep. 1905, p. 53, from Goode (PI. 250). 
Isurus dekayi. 
Pl. r in Rep. 1905, from Jordan and Evermann (PI. 6, fig. 21). 
Lamna cornubica. 
Fig. in Rep. 1905, p. 56, from Goode (PI. 249). 
Cetorhinus maximus. 
Fig. in Rep. 1905, p. 57, from Goode (PI. 249 copied). 
Cynais canis. 
Fig. in Rep. 1906, p. 255, from Storer (PI. 31, figs. 2-2a). 
Galeocerdo tigrinus. 
Pl. 71 in Rep. 1906, from Miiller and Henle (opposite p. 60). 
Carcharhinus obscurus. 
Pl. 72 in Rep. 1906, from Le Sueur (Journ. Acad. Nat. Sci. Phila., 7, pt [, 
1818, p. 223, Pl. —). 
25 MU (385) 
